I believe that the OP is referring to the cat food as a supplement/top dress as one would use Calf Manna, Poultry Cell, Poultry Booster, 58% Protein Supplement etc.
Chris
16% protein sounds a little low for a show feed, Most of the breeders/ exhibitors I know feed from 18 to 20 percent protein. 16% protein sounds more like a off season or a grower.
Chris